U.S. Plans to Widen Airstrikes in Middle East Could Complicate Security in Southeast Asia

U.S. President Barack Obama's plans to widen airstrikes against Islamist militants could complicate the task for Asian security officials already worrying about the Middle East conflict spilling over to countries such as Malaysia, Indonesia and the Philippines.

Governments in France and Britain have for years raised the threat that their citizens, returning after fighting with the Islamic State, could attack targets in their home countries. Britain has a policy of arresting returning nationals if they are suspected of involvement...